Display apparatus comprising a blue light blocking pattern overlapping a thin film transistor and a color conversion pattern comprising a quantum dot or phosphor

ABSTRACT

A display apparatus includes a backlight unit to emit blue light, a first base substrate disposed on the backlight unit, a gate pattern disposed on the first base substrate, a first inorganic insulation layer disposed on the gate pattern, a data pattern disposed on the first inorganic insulation layer, a blue light blocking pattern disposed on the first inorganic insulation layer on which the data pattern is disposed, a second inorganic insulation layer disposed on the data pattern and the first inorganic insulation layer, a shielding electrode disposed on the blue light blocking pattern and overlapping the gate pattern and/or the data pattern, a pixel electrode disposed on the second inorganic insulation layer, and electrically connected to the drain electrode, a color conversion pattern overlapping the pixel electrode, and includes a quantum dot and/or phosphor, and a liquid crystal layer disposed between the pixel electrode and the color conversion pattern.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from and the benefit of Korean PatentApplication No. 10-2017-0085480, filed on Jul. 5, 2017, which is herebyincorporated by reference for all purposes as if fully set forth herein.

BACKGROUND

Field

Exemplary embodiments relate to a display apparatus and a method ofmanufacturing the display apparatus. More particularly, exemplaryembodiments relate to a display apparatus using photoluminescence and amethod of manufacturing the display apparatus.

Discussion of the Background

Recently, a display apparatus having light weight and small size hasbeen manufactured. Previously, a cathode ray tube (CRT) displayapparatus has been used due to its performance and competitive price.However the CRT display apparatus has a weakness with size and/orportability. Therefore a display apparatus such as a plasma displayapparatus, a liquid crystal display apparatus, and an organic lightemitting display apparatus has been highly regarded due to their smallsize, light weight, and low-power-consumption.

The display apparatus may further include a photoluminescence device.The photoluminescence device includes a color conversion structure forconverting the color of light, such as a quantum dot. A desired colorcan be imparted to the image by the photoluminescence device. Thus,color reproducibility of the image and the luminous efficiency can beimproved, so that the display quality can be improved. The displayapparatus including the photoluminescence device can use a backlightunit which generates blue light. However, it has been found that thereis a problem with lowered transmittance due to the insulating filmstructure inside the display apparatus.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the inventive concept,and, therefore, it may contain information that does not form the priorart that is already known in this country to a person of ordinary skillin the art.

SUMMARY

Exemplary embodiments provide a display apparatus capable of improvingtransmittance.

Exemplary embodiments also provide a method of manufacturing the displayapparatus.

Additional aspects will be set forth in the detailed description whichfollows, and, in part, will be apparent from the disclosure, or may belearned by practice of the inventive concept.

According to exemplary embodiments, a display apparatus includes abacklight unit to emit blue light, a first base substrate disposed onthe backlight unit, a gate pattern disposed on the first base substrate,a first inorganic insulation layer disposed on the gate pattern, a datapattern disposed on the first inorganic insulation layer, a blue lightblocking pattern disposed on the first inorganic insulation layer onwhich the data pattern is disposed, a second inorganic insulation layerdisposed on the data pattern and the first inorganic insulation layer, ashielding electrode disposed on the blue light blocking pattern andoverlapping the gate pattern and/or the data pattern, a pixel electrodedisposed on the second inorganic insulation layer, and electricallyconnected to the drain electrode, a color conversion pattern overlappingthe pixel electrode, and comprising a quantum dot and/or phosphor, and aliquid crystal layer disposed between the pixel electrode and the colorconversion pattern.

In an exemplary embodiment, the data pattern may include a sourceelectrode, a drain electrode and a data line. The shielding electrodemay overlap the data line. The blue light blocking pattern may bedisposed between the data line and the shielding electrode.

In an exemplary embodiment, the shielding electrode may include a firstshielding electrode and a second shielding electrode which is spacedapart from the first shielding electrode and extends in parallel withthe first shielding electrode.

In an exemplary embodiment, the pixel electrode and the shieldingelectrode may include transparent conductive material.

In an exemplary embodiment, the blue light blocking pattern may bedisposed between the first inorganic insulation layer and the secondinorganic insulation layer.

In an exemplary embodiment, the first inorganic insulation layer and thesecond inorganic insulation layer may be disposed between the pixelelectrode and the first base substrate. The pixel electrode may belocated within 2 um (micrometer) from the first base substrate.

In an exemplary embodiment, an organic insulating layer may be notpresent between the pixel electrode and the first base substrate.

In an exemplary embodiment, the display apparatus may further include asecond base substrate opposite to the first base substrate, a blue lightblocking layer disposed on the second base substrate, and a transparentpattern disposed on the second base substrate. The color conversionpattern may be disposed on the blue light blocking layer, and include afirst color conversion pattern which includes a red quantum dot and/orred phosphor, and a second color conversion pattern which includes agreen quantum dot and/or green phosphor.

In an exemplary embodiment, the display apparatus may further include apolarizer disposed between the color conversion pattern and the liquidcrystal layer and between the transparent pattern and the liquid crystallayer.

In an exemplary embodiment, the display apparatus may further include alight blocking pattern disposed on the second base substrate andoverlapping the shielding electrode.

In an exemplary embodiment, the display apparatus may further include amain column spacer disposed on the second inorganic insulation layer andoverlapping the gate pattern.

In an exemplary embodiment, the gate pattern, the first inorganicinsulation layer, the blue light blocking pattern and the secondinorganic insulation layer may be disposed between the main columnspacer and the first base substrate.

In an exemplary embodiment, the display apparatus may further include athin film transistor disposed on the first base substrate. The bluelight blocking pattern may overlap the thin film transistor. The bluelight blocking pattern may be disposed between the thin film transistorand the liquid crystal layer.

In an exemplary embodiment, the blue light blocking pattern may be a redcolor filter.

In an exemplary embodiment, the blue light blocking pattern may haveabout 1 to 2 μm (micrometer).

According to exemplary embodiments, a method of manufacturing a displayapparatus includes providing a backlight unit emitting blue light,forming a gate pattern on a first base substrate, forming a firstinorganic insulation layer on the gate pattern, forming a data patternon the first inorganic insulation layer, forming a blue light blockingpattern on the data pattern, forming a second insulation layer on theblue light blocking pattern, forming a shielding electrode and a pixelelectrode on the second inorganic insulation layer, forming a colorconversion pattern comprising a quantum dot and/or phosphor on a secondbase substrate, forming a planarization layer on the color conversionpattern, forming a wire grid polarizer on the planarization layer, andforming a liquid crystal layer between the first base substrate on whichthe pixel electrode is formed and the second base substrate on which thewire grid polarizer is formed.

In an exemplary embodiment, the data pattern may include a sourceelectrode, a drain electrode and a data line. The shielding electrodemay overlap the data line. The blue light blocking pattern may bedisposed between the data line and the shielding electrode.

In an exemplary embodiment, the method may further include forming amain column spacer on the second insulation layer. The gate pattern, thefirst inorganic insulation layer, the blue light blocking pattern andthe second inorganic insulation layer may be disposed between the firstmain column spacer and the first base substrate.

In an exemplary embodiment, the gate pattern may include a gateelectrode and a gate pattern. The gate electrode, the source electrodeand the drain electrode may be included in a thin film transistor. Theblue light blocking pattern may be disposed between the thin filmtransistor and the liquid crystal layer.

In an exemplary embodiment, the blue light blocking pattern may be a redcolor filter.

According to exemplary embodiments, since the organic insulating layeris omitted in the lower substrate on which the thin film transistor isformed, and the display apparatus includes only the inorganic insulatinglayer, loss of transmittance of the blue light emitted from thebacklight unit may be minimized.

In addition, the display apparatus may include a shielding electrodeoverlapping the data line and the gate line. A blue light blockingpattern may be formed between the data line and the shielding electrode,and between the gate line and the shielding electrode. Accordingly, itis possible to prevent deterioration of display quality due to parasiticcapacitance between the data and gate lines and the shielding electrode,and it is possible to prevent light leakage caused by inability tocontrol the liquid crystal around the gate line and the data line.

In addition, since the blue light blocking pattern is located on thethin film transistor, the characteristics of the thin film transistormay be improved, and the sub-column spacer may be formed. Thus, whenforming the main column spacer, it is possible to secure a pressing gapwithout forming a separate sub-column spacer using a halftone mask orthe like.

The foregoing general description and the following detailed descriptionare exemplary and explanatory and are intended to provide furtherexplanation of the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the inventive concepts, and are incorporated in andconstitute a part of this specification, illustrate exemplaryembodiments of the inventive concepts, and, together with thedescription, serve to explain principles of the inventive concepts.

FIG. 1 is a block diagram illustrating a display apparatus according toan exemplary embodiment of the inventive concepts.

FIG. 2 is a plan view illustrating first to third pixel areas of thedisplay apparatus of FIG. 1.

FIG. 3A is a cross-sectional view taken along a line I-I′ of FIG. 2.

FIG. 3B is a cross-sectional view taken along a line II-II′ of FIG. 2.

FIG. 3C is a cross-sectional view taken along a line III-III′ of FIG. 2.

FIGS. 4A, 4B, 4C, 5A, 5B, 5C, 6A, 6B, 6C, 7A, 7B and 7C are plan viewsand cross sectional views illustrating a method of manufacturing thedisplay apparatus of FIG. 2.

FIG. 8 is a plan view illustrating first to third pixel areas of adisplay apparatus according to an exemplary embodiment of the inventiveconcepts.

FIG. 9 is a cross-sectional view taken along a line III-III′ of FIG. 8.

FIG. 10 is a plan view illustrating first to third pixel areas of adisplay apparatus according to an exemplary embodiment of the inventiveconcepts.

FIG. 11 is a cross-sectional view taken along a line IV-IV′ of FIG. 10.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

In the following description, for the purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of various exemplary embodiments. It is apparent, however,that various exemplary embodiments may be practiced without thesespecific details or with one or more equivalent arrangements. In otherinstances, well-known structures and devices are shown in block diagramform in order to avoid unnecessarily obscuring various exemplaryembodiments.

In the accompanying figures, the size and relative sizes of layers,films, panels, regions, etc., may be exaggerated for clarity anddescriptive purposes. Also, like reference numerals denote likeelements.

When an element or layer is referred to as being “on,” “connected to,”or “coupled to” another element or layer, it may be directly on,connected to, or coupled to the other element or layer or interveningelements or layers may be present. When, however, an element or layer isreferred to as being “directly on,” “directly connected to,” or“directly coupled to” another element or layer, there are no interveningelements or layers present. For the purposes of this disclosure, “atleast one of X, Y, and Z” and “at least one selected from the groupconsisting of X, Y, and Z” may be construed as X only, Y only, Z only,or any combination of two or more of X, Y, and Z, such as, for instance,XYZ, XYY, YZ, and ZZ. Like numbers refer to like elements throughout. Asused herein, the term “and/or” includes any and all combinations of oneor more of the associated listed items.

Although the terms first, second, etc. may be used herein to describevarious elements, components, regions, layers, and/or sections, theseelements, components, regions, layers, and/or sections should not belimited by these terms. These terms are used to distinguish one element,component, region, layer, and/or section from another element,component, region, layer, and/or section. Thus, a first element,component, region, layer, and/or section discussed below could be termeda second element, component, region, layer, and/or section withoutdeparting from the teachings of the present disclosure.

Spatially relative terms, such as “beneath,” “below,” “lower,” “above,”“upper,” and the like, may be used herein for descriptive purposes, and,thereby, to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the drawings. Spatiallyrelative terms are intended to encompass different orientations of anapparatus in use, operation, and/or manufacture in addition to theorientation depicted in the drawings. For example, if the apparatus inthe drawings is turned over, elements described as “below” or “beneath”other elements or features would then be oriented “above” the otherelements or features. Thus, the exemplary term “below” can encompassboth an orientation of above and below. Furthermore, the apparatus maybe otherwise oriented (e.g., rotated 90 degrees or at otherorientations), and, as such, the spatially relative descriptors usedherein interpreted accordingly.

The terminology used herein is for the purpose of describing particularembodiments and is not intended to be limiting. As used herein, thesingular forms, “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise. Moreover,the terms “comprises,” “comprising,” “includes,” and/or “including,”when used in this specification, specify the presence of statedfeatures, integers, steps, operations, elements, components, and/orgroups thereof, but do not preclude the presence or addition of one ormore other features, integers, steps, operations, elements, components,and/or groups thereof.

Various exemplary embodiments are described herein with reference tosectional illustrations that are schematic illustrations of idealizedexemplary embodiments and/or intermediate structures. As such,variations from the shapes of the illustrations as a result, forexample, of manufacturing techniques and/or tolerances, are to beexpected. Thus, exemplary embodiments disclosed herein should not beconstrued as limited to the particular illustrated shapes of regions,but are to include deviations in shapes that result from, for instance,manufacturing. As such, the regions illustrated in the drawings areschematic in nature and their shapes are not intended to illustrate theactual shape of a region of a device and are not intended to belimiting.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure is a part. Terms,such as those defined in commonly used dictionaries, should beinterpreted as having a meaning that is consistent with their meaning inthe context of the relevant art and will not be interpreted in anidealized or overly formal sense, unless expressly so defined herein.

Hereinafter, the inventive concept will be explained in detail withreference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a display apparatus according toan exemplary embodiment.

Referring to FIG. 1, the display apparatus may include a display panel10 and a display panel driver. The display panel driver may include atiming controller 20, a gate driver 30, a gamma reference voltagegenerator 40, and a data driver 50. The display apparatus may furtherinclude a backlight unit (see BLU of FIG. 3A).

The display panel 10 may include a plurality of gate lines GL, aplurality of data lines DL, and a plurality of pixels electricallyconnected to the gate lines GL and the data lines DL. The gate lines GLmay extend in a first direction D1 and the data lines DL may extend in asecond direction D2 crossing the first direction D1.

The display panel 10 may include a first substrate, a second substratefacing the first substrate, and a liquid crystal layer disposed betweenthe first substrate and the second substrate. The gate lines, the datalines, pixel electrodes of the pixels, and the switching elements may beformed on the first substrate. A common electrode may be formed on thesecond substrate. A detailed description thereof will be described laterwith reference to FIGS. 2, 3A, 3B, and 3C.

The timing controller 20 may receive input image data IMG and an inputcontrol signal CONT from an external apparatus (not shown). The inputimage data may include red image data, green image data, and blue imagedata. The input control signal CONT may include a master clock signaland a data enable signal. The input control signal CONT may furtherinclude a vertical synchronizing signal and a horizontal synchronizingsignal.

The timing controller 20 may generate a first control signal CONT1, asecond control signal CONT2, a third control signal CONT3, and a datasignal DATA based on the input image data IMG and the input controlsignal CONT.

The timing controller 20 may generate the first control signal CONT1 forcontrolling an operation of the gate driver 30 based on the inputcontrol signal CONT, and outputs the first control signal CONT1 to thegate driver 30. The first control signal CONT1 may further include avertical start signal and a gate clock signal.

The timing controller 20 may generate the second control signal CONT2for controlling an operation of the data driver 50 based on the inputcontrol signal CONT, and outputs the second control signal CONT2 to thedata driver 50. The second control signal CONT2 may include a horizontalstart signal and a load signal.

The timing controller 20 may generate the data signal DATA based on theinput image data IMG. The timing controller 20 may output the datasignal DATA to the data driver 50.

The timing controller 20 may generate the third control signal CONT3 forcontrolling an operation of the gamma reference voltage generator 40based on the input control signal CONT, and output the third controlsignal CONT3 to the gamma reference voltage generator 40.

The gate driver 30 may generate gate signals driving the gate lines GLin response to the first control signal CONT1 received from the timingcontroller 20. The gate driver 30 may sequentially output the gatesignals to the gate lines GL.

The gamma reference voltage generator 40 may generate a gamma referencevoltage VGREF in response to the third control signal CONT3 receivedfrom the timing controller 20. The gamma reference voltage generator 40may provide the gamma reference voltage VGREF to the data driver 50. Thegamma reference voltage VGREF may have a value corresponding to a levelof the data signal DATA.

In an exemplary embodiment, the gamma reference voltage generator 40 maybe disposed in the timing controller 20 or in the data driver 50.

The data driver 50 may receive the second control signal CONT2 and thedata signal DATA from the timing controller 20, and receive the gammareference voltages VGREF from the gamma reference voltage generator 40.The data driver 50 may convert the data signal DATA into data voltageshaving an analog type using the gamma reference voltages VGREF. The datadriver 50 may output the data voltages to the data lines DL.

The display apparatus may include a plurality of pixel areas arranged ina matrix form. The pixel areas may include a first pixel area PX1, asecond pixel area PX2, and a third pixel area PX3 which are disposedadjacent to each other.

FIG. 2 is a plan view illustrating first to third pixel areas of thedisplay apparatus of FIG. 1. FIG. 3A is a cross-sectional view takenalong a line I-I′ of FIG. 2. FIG. 3B is a cross-sectional view takenalong a line II-II′ of FIG. 2. FIG. 3C is a cross-sectional view takenalong a line of FIG. 2.

Referring to FIGS. 2, 3A, and 3C, the display apparatus may include abacklight unit BLU, a first base substrate 100, a gate pattern, a firstinorganic insulation layer 110, an active pattern ACT, a data pattern, ablue light blocking pattern 120, a second inorganic insulation layer130, a transparent electrode layer, a main column spacer MCS, a liquidcrystal layer LC, a common electrode CE, a capping layer 240, apolarizer POL, a planarization layer 230, a light recycling filter layer220, a transparent pattern T, a first color conversion pattern R, asecond color conversion pattern G, a blue light blocking layer 210, alight blocking layer BM, and a second base substrate 200.

The backlight unit BLU may be disposed under the first base substrate100 to provide light to the liquid crystal layer LC. More specifically,the backlight unit BLU may include a light source for generating lighthaving a first wavelength and a light guide plate (not shown) forreceiving the light generated from the light source and guiding thelight toward the liquid crystal layer LC. The first wavelength may befrom about 400 nm to about 500 nm and the light may be blue. Thus, thebacklight unit BLU may generate blue light and provide the blue light tothe liquid crystal layer LC. For example, the backlight unit BLU mayinclude a blue light emitting diode as the light source.

The first base substrate 100 may be disposed on the backlight unit BLU.The first base substrate 100 may include a transparent insulationsubstrate. For example, the first base substrate 100 may include a glasssubstrate, a quartz substrate, a transparent resin substrate, etc.Examples of the transparent resin substrate for the first base substrate100 may include polyimide-based resin, acryl-based resin,polyacrylate-based resin, polycarbonate-based resin, polyether-basedresin, sulfonic acid containing resin, polyethyleneterephthalate-basedresin, etc.

The gate pattern may be disposed on the first base substrate 100. Thegate pattern may include a gate line GL, a gate electrode GE, a floatingelectrode FE, and a CST line CST.

The gate line GL may extend in a first direction D1. The gate electrodeGE may electrically connected to the gate line GL. The gate electrode GEmay protrude from the gate line GL in a second direction D2 crossing thefirst direction D1. The second direction D2 may be substantiallyperpendicular to the first direction D1. The floating electrode FE maybe spaced part from the gate line GL. The floating electrode FE may bespaced apart from the gate line GL. The floating electrode FE may be ina floating state in which no additional voltage is applied. The CST lineCST may extend in the first direction D1 and the second direction D2,and may be formed so as to overlap with edge of the pixel electrode PE,described later. In order to prevent light leakage at the edge portionof the pixel electrode PE, a CST voltage may be applied to the CST lineCST. The CST line CST may be connected to the CST line of theneighboring pixel in the first direction D1.

The inorganic insulation layer 110 may be disposed on the gate patternand the first base substrate 100. The first inorganic insulation layer110 may include an inorganic insulating material. The first inorganicinsulating layer 110 may have a thickness of about 1 μm (micrometer) orless. For example, the first inorganic insulating layer 110 may have athickness of about 0.1 μm.

The active pattern ACT may be disposed on the first inorganic insulationlayer 110. The active pattern ACT may overlap the gate electrode GE. Theactive pattern ACT may include a semiconductor layer consisting ofamorphous silicon (a-Si:H) and an ohmic contact layer consisting of n+amorphous silicon (n+ a-Si:H). In some exemplary embodiments, the activepattern ACT may include an oxide semiconductor. For example, the oxidesemiconductor may be an amorphous oxide containing at least one ofindium (In), zinc (Zn), gallium (Ga), tin (Sn), or hafnium (Hf).

The data pattern may be disposed on the active pattern ACT and the firstinorganic insulating layer 110. The data pattern may include a data lineDL, a source electrode SE, and a drain electrode DE. The data line DLmay extend in a second direction D2, and be electrically connected tothe source electrode SE. The drain electrode DE may be spaced apart fromthe source electrode SE, and a portion of the drain electrode DE may beoverlapped with the floating electrode FE. A portion of the activepattern ACT located between the source electrode SE and the drainelectrode DE may form a channel region. The gate electrode GE, theactive pattern ACT, the source electrode SE, and the drain electrode DEmay be included in a thin film transistor TFT.

In the present exemplary embodiment, the data pattern is formed to havesubstantially the same outer pattern of active pattern ACT using thesame mask as the active pattern ACT, but the present disclosure is notlimited thereto. For example, the active pattern ACT and the datapattern may be formed using different masks and have different patternshapes.

The blue light blocking pattern 120 may be formed on the data line DLand the thin film transistor TFT to overlap the data line DL and thethin film transistor TFT. The blue light blocking pattern 120 may be anymaterial that absorbs blue light, for example, a red color filter. Atypical light blocking member has a black color and it is not easy toinspect the transistor during a manufacturing process of a displayapparatus. However, when the blue light blocking pattern 120 is the redcolor filter, a position of the thin film transistor TFT can be easilyfound and an inspection process can be simplified in the manufacturingprocess of the display apparatus. The blue light blocking pattern 120may have a thickness of about 0.5 to 2 micrometers. Preferably, the bluelight blocking pattern 120 may have a thickness of about 0.8 to 1.2 um.

The blue light blocking pattern 120 may absorb light having a firstwavelength of about 400 nm to about 500 nm. The backlight unit BLU mayemit light having the first wavelength, i.e., the blue light, and theblue light blocking pattern 120 may absorb the blue light directly ormay absorb the blue light reflected by the polarizer POL. The blue lightblocking pattern 120 can be any material that absorbs this light. Forexample, the blue light blocking pattern 120 may be a green colorfilter. In some exemplary embodiments, the blue light blocking pattern120 may be black light blocking pattern.

The blue light blocking pattern 120 can prevent the blue light reflectedby the polarizing element POL from being incident on the channel regionof the thin film transistor TFT to deteriorate performance of the thinfilm transistor TFT. A portion of the blue light emitted from thebacklight unit BLU may be reflected by the polarizer POL made of a metaland a portion of the reflected light may be incident on the thin filmtransistor TFT. The incident blue light may affect the channel regionand leakage current of the transistor may increase. However, since theblue light blocking pattern 120 can block the blue light incident on thechannel region, current leakage of the thin film transistor TFT can beprevented and reliability can be improved.

The second inorganic insulation layer 130 may be disposed on the bluelight blocking pattern 120. The second insulation layer 130 may includean inorganic insulating material. The second insulation layer 130 mayhave a thickness of about 1 μm (micrometer) or less. For example, thesecond insulation layer 130 may have a thickness of about 0.1 um.

The transparent electrode layer may be disposed on the second inorganicinsulation layer 130. The transparent electrode layer may include apixel electrode PE and a shielding electrode SCOM.

The pixel electrode PE may be electrically connected to the thin filmtransistor TFT through a contact hole CNT formed through the secondinsulation layer 130. The pixel electrode PE may include a transparentconductive material. For example, the pixel electrode PE may includeindium tin oxide (ITO), indium zinc oxide (IZO), etc.

The shielding electrode SCOM may extend in the second direction D2 andmay overlap the second data line DL. The blue light blocking pattern 120and the second inorganic insulating layer 130 are located between thedata line DL and the shield electrode SCOM, so that a parasiticcapacitance between the data line DL and the shield electrode SCOM issmall as compared with the case where only the inorganic insulatinglayer is formed. Thus, it is possible to prevent display qualitydeterioration due to the parasitic capacitance.

In addition, the shielding electrode SCOM may extend in the firstdirection D1 and may overlap the gate line GL.

In addition, the blue light blocking pattern 120 may not be formed at aportion where the contact hole CNT is formed, that is, at a portionwhere the pixel electrode PE and the drain electrode DE of the thin filmtransistor TFT are connected to each other. Thus, the blue lightblocking pattern 120 may form an opening corresponding to the contacthole CNT.

In addition, the blue light blocking pattern 120 may not be formed in aportion where the pixel electrode PE is formed. Thus, the blue lightblocking pattern 120 may form an opening corresponding to the pixelelectrode PE.

The main column spacer MCS may be disposed on the second insulationlayer 130. The main column spacer MCS may maintain a cell gap. The maincolumn spacer MCS may be disposed to overlap with the floating electrodeFE and the blue light blocking pattern 120.

In addition, a portion of the blue light blocking pattern 120 where thethin film transistor TFT is formed may have a height higher than otherportions of the blue light blocking pattern 120 due to a height of thethin film transistor TFT. The portion of the blue light blocking pattern120 and a portion of the second insulating layer 130 where the thin filmtransistor TFT is formed may form a sub-column spacer SCS. Thesub-column spacer SCS is formed at a lower height than the main columnspacer MCS, and can maintain a pressed cell gap.

For example, the main column spacer MCS can have a height of about 2.23μm. An upper surface of the sub-column spacer SCS may be about 0.5 μmlower than the top surface of the main column spacer MCS.

The liquid crystal layer LC may be disposed on the pixel electrode PEand the second inorganic insulating layer 130 on which the main columnspacer MCS is disposed. Thus, the liquid crystal layer LC may bedisposed between the pixel electrode PE and the common electrode CE. Theliquid crystal layer LC may include liquid crystal molecules havingoptical anisotropy. The liquid crystal molecules may be driven by anelectric field to transmit or block light passing through the liquidcrystal layer LC to display an image.

The common electrode CE may be disposed on the liquid crystal layer LC.A common voltage may be applied to the common electrode CE. The commonelectrode CE may include a transparent conductive material. For example,the common electrode CE may include indium tin oxide (ITO), indium zincoxide (IZO), and the like.

A capping layer 240 may be disposed on the common electrode CE. Thecapping layer 240 may be disposed between the polarizer POL and thecommon electrode CE to cap the polarizer POL. The capping layer 240 mayinclude an inorganic or organic insulating material.

The polarizer POL may be disposed on the capping layer 240. Thepolarizer POL may be a wire grid polarizer. The wire grid polarizer mayinclude a plurality of fine wires extending in one direction, which areformed of metal and arranged at regular interval. The fine wires mayhave a pitch of about 50 nm (nanometer) to 150 nm. The pitch refers to asum of a width of the fine line and a distance between adjacent finelines.

The planarization layer 230 may be disposed on the polarizer POL. Asurface of the planarization layer 230 in contact with the polarizer POLmay be flat. The planarization layer 230 may include an organic orinorganic insulating material.

The light recycling filter layer 220 may be disposed on theplanarization layer 230. The light recycling filter layer 220 may be ayellow light recycling filter. The light recycling filter layer 220 mayreflect the blue light which is emitted from the backlight unit BLU andreflected toward the liquid crystal layer LC while passing thetransparent pattern T, the first color conversion pattern R, the secondcolor conversion pattern G, and the blue light blocking layer 210, sothat the brightness of the display apparatus can be improved.

The transparent pattern T may be disposed on the light recycling filterlayer 220 in the first pixel area PX1. The transparent pattern T mayinclude scattering particles that change traveling direction withoutchanging the wavelength of the blue light provided by the backlight unitBLU. The scattering particles may be particles such as TiO₂, Al₂O₃, andSiO₂, and size of scattering particle may be based on the size of redquantum dot or green quantum dot. In addition, the transparent pattern Tmay further include a blue pigment for converting transmitted light intoblue light.

The first color conversion pattern R may be disposed in the second pixelregion PX2 on the light recycling filter layer 220. The first colorconversion pattern R may be a red color conversion pattern. The firstcolor conversion pattern R may convert the blue light provided by thebacklight unit BLU into red light. For example, the first colorconversion pattern R may include color conversion materials such as redquantum dot particles and/or red phosphors.

The second color conversion pattern G may be disposed on the lightrecycling filter layer 220 in the third pixel region PX3. The secondcolor conversion pattern G may be a green color conversion pattern. Thesecond color conversion pattern G may convert the blue light provided bythe backlight unit BLU into green light. For example, the second colorconversion pattern G may include color conversion materials such asgreen quantum dot particles and/or green phosphors.

The red or green quantum dot may be a material that has a nano-scaledstructure and may include several hundred to several thousand atoms.Since the quantum dot is very small in size, a quantum confinementeffect may occur. The quantum confinement effect may indicate that anenergy band gap of an object is increased when the object becomessmaller than nano size. When the light having energy higher than that ofthe band gap is incident to the quantum dot, the quantum dot may absorbthe light and may emit a second light having a specific wavelength andan energy level in the ground state. The wavelength of the emittedsecond light may have a value corresponding to the band gap. When a sizeand a composition of the quantum dot are adjusted, the emission propertyof the quantum dot may be controlled by the quantum confinement.

The composition of the quantum dots is not limited to a specificcomposition, and any suitable composition may be used. For example, thequantum dot may be a quantum dot of Group II-VI elements, Group III-Velements, Group IV elements, or Group IV-VI elements. The Group IIelements may be selected from the group consisting of at least one ofzinc, cadmium, and mercury. The group III elements may be selected fromthe group consisting of at least one of aluminum, gallium, and indium.The Group IV elements may be selected from the group consisting of atleast one of silicon, germanium, tin, and lead. The Group V elements maybe selected from the group consisting of at least one of nitrogen,phosphorus, and arsenic. The Group VI elements may be selected from thegroup consisting of at least one of sulfur, selenium, and tellurium.

The red phosphor may be one of (Ca, Sr, Ba)S, (Ca, Sr, Ba)₂Si₅N₈,CaAlSiN₃, CaMoO₄, and Eu₂Si₅N₈, but is not limited thereto.

The green phosphor may be at least one selected from the groupconsisting of yttrium aluminum garnet (YAG), (Ca, Sr, Ba)₂SiO₄, SrGa₂S₄,barium magnesium aluminate (BAM), alpha-SiAlON(α-SiAlON),beta-SiAlON(β-SiAlON), Ca₃Sc₂Si₃O₁₂, Tb₃Al₅O₁₂, BaSiO₄, CaAlSiON, and(Sr1-xBax)Si₂O₂N₂, but is not limited thereto.

The blue light blocking layer 210 may be disposed on the first colorconversion pattern R and the second color conversion pattern G. Thus,the blue light blocking layer 210 may be disposed in the second pixelregion PX2 and the third pixel region PX3. The blue light blocking layer210 may be formed by alternately laminating at least two layers havingdifferent refractive indexes. The blue light blocking layer 210 maytransmit wavelengths except the blue wavelength band of transmittedlight and block the blue wavelength band. The blocked blue light may bereflected for optical recycling.

The blue light incident from the backlight unit BLU is converted intored or green through the first or second color conversion pattern R orG. At this time, some of the blue light is not changed and passestherethrough. The blue light blocking layer 210 may have a structure inwhich a single layer or a plurality of layers are stacked. The bluelight blocking layer 210 may include any material for performing theabove-mentioned effects, and may be a yellow color filter, for example.

The light blocking pattern BM may be disposed on the second basesubstrate 200. The light blocking pattern BM may overlap with the thinfilm transistor TFT, the gate line GL, the data line DL, the floatingelectrode FE, and the main column spacer MCS.

The second base substrate 200 may be disposed on the light blockingpattern BM, the blue light blocking layer 210, and the transparentpattern T. The second base substrate 200 may include a transparentinsulation substrate. For example, the second base substrate 200 mayinclude a glass substrate, a quartz substrate, a transparent resinsubstrate, etc. Examples of the transparent resin substrate for thesecond base substrate 200 may include polyimide-based resin, acryl-basedresin, polyacrylate-based resin, polycarbonate-based resin,polyether-based resin, sulfonic acid containing resin,polyethyleneterephthalate-based resin, etc.

Although not shown, the display apparatus may include an upper alignmentlayer formed between the liquid crystal layer LC and the commonelectrode CE, a lower alignment layer formed between the liquid crystallayer LC and the pixel electrode PE, a lower polarizer disposed betweenthe second base substrate 200 and the backlight unit BLU, etc.

In the case of a backlight unit of a general display apparatus, whitelight is emitted, but the display apparatus according to the exemplaryembodiment of the present disclosure emits blue light as describedabove. In the case of blue light having a short wavelength, loss oftransmittance may occur due to the organic insulating layer locatedinside the display apparatus. However, in the display apparatusaccording to the present disclosure, since the organic insulating layeris omitted in the lower substrate on which the thin film transistor isformed and only the inorganic insulating layer is included, the loss oftransmittance can be minimized. Table 1 below shows a difference inluminance when the display apparatus displays white color in case of anorganic insulating film is applied to a lower substrate and in case ofan inorganic insulating film is applied.

TABLE 1 Organic insulation layer Inorganic insulation layer Sample 1 2 34 5 White 146.6 142.4 144.7 191.6 188.8 luminance

As shown in Table 1, the luminance is decreased when the organicinsulating film is used, and the luminance is increased when theinorganic insulating film is used.

In addition, the display apparatus may include a shielding electrodeSCOM overlapping the data line DL and the gate line GL, and the bluelight blocking pattern 120 may be formed between the data line DL andthe shielding electrode SCOM, and between the gate line GL and theshielding electrode SCOM. Accordingly, it is possible to preventdeterioration of display quality due to parasitic capacitance betweenthe data and gate lines DL and GL and the shielding electrode 120, andit is possible to prevent light leakage caused by inability to controlthe liquid crystal around the gate line GL and the data line DL.

In addition, since the blue light blocking pattern 120 is located on thethin film transistor TFT, the characteristics of the thin filmtransistor TFT may be improved, and the sub-column spacer SCS may beformed. Thus, when forming the main column spacer MCS, it is possible tosecure a pressing gap without forming a separate sub-column spacer usinga halftone mask or the like.

Referring again to FIG. 3C, a width e of the blue light blocking pattern120 may be substantially the same as a width of the light blockingpattern a. A width c of the shielding electrode SCOM may be greater thana width b of the data line DL. Preferably, the width c of the shieldingelectrode SCOM may be greater than the width b of the data line DL byabout 4.5 um or more. The blue light blocking pattern 120 and the pixelelectrode PE may be spaced apart from each other by a predetermineddistance. Preferably, a separation distance d between the blue lightshielding pattern 120 and the pixel electrode PE may be about 3.5 μm ormore. The widths or thicknesses of the above structures are illustrativeof the numerical values according to one exemplary embodiment, but arenot limited thereto.

FIGS. 4A, 4B, 4C, 5A, 5B, 5C, 6A, 6B, 6C, 7A, 7B and 7C are plan viewsand cross sectional views illustrating a method of manufacturing thedisplay apparatus of FIG. 2.

Referring to FIGS. 4A, 4B, and 4C, a gate pattern may be formed on thefirst base is substrate 100. The first inorganic insulating layer 110may be formed on the gate pattern.

After forming a conductive layer (not shown) on the first base substrate100, the conductive layer may be patterned using a photolithographyprocess or an etching process using an additional etching mask to obtainthe gate pattern. The gate pattern may include a gate line GL, a gateelectrode GE, a floating electrode FE, and a CST line CST.

The first inorganic insulating layer 110 may be obtained by a sputteringprocess, a chemical vapor deposition process, a pulsed laser depositionprocess, or the like.

Referring to FIGS. 5A, 5B, and 5C, an active pattern ACT and a datapattern may be formed on the first inorganic insulating layer 110.

After forming an active layer (not shown) on the first inorganicinsulating layer 110, a conductive layer can be formed on the activelayer. And then, the conductive layer and the active layer may besimultaneously patterned to form the active pattern and the datapattern.

The data pattern may include a data line DL, a source electrode SE, anda drain electrode DE. The gate electrode GE, the active pattern ACT, thesource electrode SE, and the drain electrode DE may be included ascomponents of a thin film transistor TFT.

Referring to FIGS. 6A, 6B and 6C, a blue light blocking pattern 120 maybe formed on the first inorganic insulating layer 110 on which the datapattern is formed. A second inorganic insulating layer 130 may be formedon the first inorganic insulating layer 110 on which the blue lightblocking pattern 120 is formed.

The blue light blocking pattern 120 may be formed by forming a redphotoresist layer on the first inorganic insulating layer 110 and thenexposing and developing the same.

The second inorganic insulating layer 130 may be obtained by asputtering process, a chemical vapor deposition process, a pulsed laserdeposition process, or the like.

Referring to FIGS. 7A, 7B and 7C, a transparent electrode layer may beformed on the second insulating layer 130 after forming a contact holeCNT exposing the drain electrode DE through the second insulation layer130. The transparent electrode layer may include a pixel electrode PEand a shielding electrode SCOM. After forming a transparent conductivelayer (not shown) on the second insulation layer 130, the transparentconductive layer may be patterned using a photolithography process or anetching process using an additional etching mask to obtain thetransparent electrode layer.

Referring again to FIGS. 2, 3A and 3B, remaining components of thedisplay apparatus may be formed. Thus, a light shielding pattern BM maybe formed on the second base substrate 200. A blue light blocking layer210 may be formed on the second base substrate 200 on which the lightblocking pattern BM is formed. First and second color conversionpatterns R and G and the transmission pattern T may be formed on thesecond base substrate 200 on which the blue light blocking layer 210 isformed. A light recycling filter layer 220 may be formed on the firstand second color conversion patterns R and G and the transparent patternT. A planarization layer 230 may be formed on the light recycling filterlayer 220. A polarizer POL may be formed on the planarization layer 230.A capping layer 240 may be formed on the polarizer POL. A commonelectrode CE may be formed on the capping layer 240.

A liquid crystal layer LC may be formed between an upper substrate onwhich the common electrode CE is formed and a lower substrate on whichthe pixel electrode PE is formed to form a display panel including theupper substrate and the lower substrate. The display apparatus may bemanufactured by providing a backlight unit BLU under the display panel.

FIG. 8 is a plan view illustrating first to third pixel areas of adisplay apparatus according to an exemplary embodiment. FIG. 9 is across-sectional view taken along a line III-III′ of FIG. 8.

Referring to FIGS. 8 and 9, the display apparatus may be substantiallythe same as the display apparatus of FIGS. 2 to 3B except that theshielding electrode SCOM includes a first shielding electrode portionSCOM1 and a second shielding electrode portion SCOM2. Therefore,repeated description will be omitted.

The shielding electrode SCOM may include the first shield electrodeportion SCOM1 and the second shield electrode portion SCOM2 spaced apartfrom and extending in parallel to the first shield electrode portionSCOM1 and the first shield electrode portion SCOM1. A region overlappingthe shielding electrode SCOM and the data line DL is smaller than thatof the exemplary embodiment of FIG. 2. Accordingly, parasiticcapacitance between the data line DL (or the gate line) and theshielding electrode SCOM is smaller than that of the exemplaryembodiment of FIG. 2. It is possible to prevent display quality fromdeteriorating due to the parasitic capacitance.

FIG. 10 is a plan view illustrating first to third pixel areas of adisplay apparatus according to an exemplary embodiment. FIG. 11 is across-sectional view taken along a line IV-IV′ of FIG. 10.

Referring to FIGS. 10 and 11, the display apparatus may be substantiallythe same as the display device of FIGS. 2 to 3B except for a position ofa main column spacer MCS. Therefore, repeated description will beomitted.

The main column spacer MCS may overlap the gate line GL. Accordingly, agate pattern, a first inorganic insulating layer 110, a blue lightblocking pattern 120, and a second inorganic insulating layer 130 may bepositioned on the main column spacer MCS and the first base substrate100.

According to exemplary embodiments, since the organic insulating layeris omitted in the lower substrate on which the thin film transistor isformed, and the display apparatus includes only the inorganic insulatinglayer, loss of transmittance of the blue light emitted from thebacklight unit may be minimized.

In addition, the display apparatus may include a shielding electrodeoverlapping the data line and the gate line. A blue light blockingpattern may be formed between the data line and the shielding electrode,and between the gate line and the shielding electrode. Accordingly, itis possible to prevent deterioration of display quality due to parasiticcapacitance between the data and gate lines and the shielding electrode,and it is possible to prevent light leakage caused by inability tocontrol the liquid crystal around the gate line and the data line.

In addition, since the blue light blocking pattern is located on thethin film transistor, the characteristics of the thin film transistormay be improved, and the sub-column spacer may be formed. Thus, whenforming the main column spacer, it is possible to secure a pressing gapwithout forming a separate sub-column spacer using a halftone mask orthe like.

Although certain exemplary embodiments and implementations have beendescribed herein, other embodiments and modifications will be apparentfrom this description. Accordingly, the inventive concepts are notlimited to such embodiments, but rather to the broader scope of thepresented claims and various obvious modifications and equivalentarrangements.

What is claimed is:
 1. A display apparatus, comprising: a backlight unitconfigured to emit blue light; a first base substrate disposed on thebacklight unit; a gate pattern disposed on the first base substrate, thegate pattern comprising a gate electrode; a first inorganic insulationlayer disposed on the gate pattern; a data pattern disposed on the firstinorganic insulation layer, the data pattern comprising a drainelectrode; a blue light blocking pattern disposed on the first inorganicinsulation layer on which the data pattern is disposed; a secondinorganic insulation layer disposed on the data pattern and the firstinorganic insulation layer; a shielding electrode disposed on the bluelight blocking pattern and overlapping the gate pattern or the datapattern; a pixel electrode disposed on the second inorganic insulationlayer, and electrically connected to the drain electrode; a colorconversion pattern overlapping the pixel electrode, the color conversionpattern comprising a quantum dot or phosphor; a liquid crystal layerdisposed between the pixel electrode and the color conversion pattern;and a thin film transistor disposed on the first base substrate, whereinthe blue light blocking pattern is disposed between the shieldingelectrode and the first base substrate, and wherein the blue lightblocking pattern overlaps the thin film transistor, and the blue lightblocking pattern is disposed between the thin film transistor and theliquid crystal layer.
 2. The display apparatus of claim 1, wherein thedata pattern further comprises a source electrode and a data line, theshielding electrode overlaps the data line, and the blue light blockingpattern is disposed between the data line and the shielding electrode.3. The display apparatus of claim 2, wherein the shielding electrodecomprises a first shielding electrode and a second shielding electrodewhich is spaced apart from the first shielding electrode and extends inparallel with the first shielding electrode.
 4. The display apparatus ofclaim 2, wherein the pixel electrode and the shielding electrodecomprise transparent conductive material.
 5. The display apparatus ofclaim 1, wherein the blue light blocking pattern is disposed between thefirst inorganic insulation layer and the second inorganic insulationlayer.
 6. The display apparatus of claim 5, wherein the first inorganicinsulation layer and the second inorganic insulation layer are disposedbetween the pixel electrode and the first base substrate, and the pixelelectrode is located within 2um (micrometer) from the first basesubstrate.
 7. The display apparatus of claim 5, wherein an organicinsulating layer is not present between the pixel electrode and thefirst base substrate.
 8. The display apparatus of claim 1, furthercomprising: a second base substrate opposite to the first basesubstrate; a blue light blocking layer disposed on the second basesubstrate; and a transparent pattern disposed on the second basesubstrate, wherein the color conversion pattern is disposed on the bluelight blocking layer, and comprises a first color conversion pattern anda second color conversion pattern, the first color conversion patterncomprises a red quantum dot or red phosphor, and the second colorconversion pattern comprises a green quantum dot or green phosphor. 9.The display apparatus of claim 8, further comprising a polarizerdisposed between the color conversion pattern and the liquid crystallayer and between the transparent pattern and the liquid crystal layer.10. The display apparatus of claim 8, further comprising a lightblocking pattern disposed on the second base substrate and overlappingthe shielding electrode.
 11. The display apparatus of claim 1, furthercomprising a main column spacer disposed on the second inorganicinsulation layer and overlapping the gate pattern.
 12. The displayapparatus of claim 11, wherein the gate pattern, the first inorganicinsulation layer, the blue light blocking pattern, and the secondinorganic insulation layer are disposed between the main column spacerand the first base substrate.
 13. The display apparatus of claim 1,wherein the blue light blocking pattern is a red color filter.
 14. Thedisplay apparatus of claim 1, wherein the blue light blocking patternhas about 1 to 2 μm.